Congress abandoned the Capitol Thursday for an almost two-week break without addressing how to combat Zika, even as public health officials issue dire warnings about the spread of the mosquito-driven virus with summer approaching.

Republican leaders insist a deal can be struck soon to provide the money federal health officials say is needed to develop a vaccine. They also downplayed the risk of waiting a little longer, arguing existing money is available for the initial steps needed to help contain the virus while lawmakers resolve the larger funding fight.